Microsoft Technical Fellow Russinovich is considered one of the foremost experts — inside or outside Microsoft — on the inner workings of Windows. He was the cofounder (in 1996) of Winternals Software — a company which Microsoft acquired in 2006. He also cofounded Sysinternals.com, for which he’s written dozens of Windows utilities, including Filemon, Regmon, Process Explorer, Rootkit Revealer and more. Prior to that, Russinovich was a resarcher at IBM’s TJ Watson Research Center, specializing in operating-system support for Web-server acceleration.